Hypothyroidism may be common in bipolar patients, particularly women. (This condition can be identified with a blood test).-----Adrenal disorders (e.g., Addison's disease, Cushing's syndrome).-----Vitamin B12 deficiency.----Certain neurologic disorders (e.g., Huntington's disease, epilepsy, brain tumors, encephalitis, multiple sclerosis).----A number of medications, including corticosteroids and c